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131
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1 // PR tree-optimization/84468 - bogus -Wstringop-truncation despite
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2 // assignment after conditional strncpy
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3 // Compile with -g to verify the warning deals properly with debug
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4 // statements.
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5 // { dg-do compile }
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6 // { dg-options "-O2 -Wstringop-truncation -g" }
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7
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8 extern "C" char* strncpy (char*, const char*, __SIZE_TYPE__);
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9
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10 char d[3];
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11
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12 void g ();
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13
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14 void fnowarn1 (const char *s)
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15 {
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16 // Update dummy but never actually use it so it's eliminated
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17 // but causes debugging statements to be emitted for each
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18 // modification.
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19 int dummy = 0;
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20
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21 try
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22 {
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23 g ();
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24 strncpy (d, s, sizeof d); // { dg-bogus "\\\[-Wstringop-truncation]" }
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25 ++dummy;
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26 }
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27 catch (...)
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28 {
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29 ++dummy;
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30 d[0] = 0;
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31 }
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32
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33 ++dummy;
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34 d[sizeof d - 1] = 0;
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35 }
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36
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37 void fnowarn2 (const char *s)
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38 {
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39 int dummy = 0;
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40
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41 try
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42 {
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43 g ();
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44 strncpy (d, s, sizeof d);
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45 ++dummy;
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46 }
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47 catch (...)
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48 {
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49 ++dummy;
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50 return;
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51 }
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52
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53 ++dummy;
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54 d[sizeof d - 1] = 0;
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55 }
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56
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57 void fnowarn3 (const char *s)
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58 {
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59 int dummy = 0;
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60
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61 try
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62 {
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63 g ();
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64 strncpy (d, s, sizeof d);
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65 ++dummy;
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66 try
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67 {
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68 ++dummy;
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69 d[sizeof d - 1] = 0;
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70 g ();
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71 }
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72 catch (...)
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73 {
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74 ++dummy;
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75 }
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76 }
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77 catch (...)
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78 {
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79 ++dummy;
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80 return;
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81 }
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82
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83 ++dummy;
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84 d[sizeof d - 1] = 0;
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85 }
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86
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87 void fnowarn4 (const char *s)
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88 {
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89 int dummy = 0;
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90
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91 try
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92 {
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93 g ();
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94 }
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95 catch (...)
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96 {
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97 strncpy (d, s, sizeof d); // { dg-bogus "\\\[-Wstringop-truncation]" "bug 84468" { xfail *-*-*} }
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98 ++dummy;
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99 }
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100
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101 ++dummy;
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102 d[sizeof d - 1] = 0;
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103 }
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104
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105 void fwarn1 (const char *s)
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106 {
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107 int dummy = 0;
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108
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109 try
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110 {
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111 ++dummy;
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112 g ();
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113 ++dummy;
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114 strncpy (d, s, sizeof d); // { dg-warning "\\\[-Wstringop-truncation]" }
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115 ++dummy;
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116 }
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117 catch (...)
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118 {
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119 ++dummy;
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120 }
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121
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122 ++dummy;
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123 }
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124
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125 void fwarn2 (const char *s)
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126 {
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127 int dummy = 0;
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128
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129 try
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130 {
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131 ++dummy;
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132 strncpy (d, s, sizeof d); // { dg-warning "\\\[-Wstringop-truncation]" }
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133 ++dummy;
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134 g ();
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135 ++dummy;
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136 }
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137 catch (...)
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138 {
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139 ++dummy;
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140 }
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141
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142 ++dummy;
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143 }
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144
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145 void fwarn3 (const char *s)
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146 {
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147 int dummy = 0;
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148
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149 try
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150 {
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151 ++dummy;
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152 g ();
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153 ++dummy;
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154 strncpy (d, s, sizeof d); // { dg-warning "\\\[-Wstringop-truncation]" }
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155 ++dummy;
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156 }
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157 catch (...)
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158 {
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159 ++dummy;
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160 d[0] = 0;
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161 }
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162
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163 ++dummy;
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164 }
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